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Improving social symptoms of depression with a common anesthetic

February 23, 2024
in Health
Improving social symptoms of depression with a common anesthetic
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depression

Credit: CC0 Public Domain

In a recent study published in Molecular Psychiatry, researchers from Osaka University have used a mouse model of depression to reveal that one form of ketamine (a common anesthetic) in low doses can improve social impairments by restoring functioning in a specific brain region called the anterior insular cortex.

Ketamine is often used at low doses to treat depression, but its actions in the brain remain relatively unclear. Generally, ketamine refers to a mix of two different forms of ketamine: (S)-ketamine and (R)-ketamine. These two molecules are mirror isomers, or enantiomers—they have the same molecular formula, but their three-dimensional forms are mirror images of one another. Although they usually occur as (S) and (R) pairs, they can also be separated into either (S)-ketamine or (R)-ketamine. Each is beneficial in treating depression, although their specific effects vary.

When the research team decided to test the effects of (S)-ketamine and (R)-ketamine on depression-like symptoms in mice, they first had to decide on an appropriate model. Given that depression and social impairments can be induced by long-term social isolation, they chose a chronic (at least 6 weeks) social isolation mouse model.

The researchers then used a method that allowed them to directly compare neuronal activation throughout the entire brains of mice treated with (S)-ketamine, (R)-ketamine, or saline (as a control) directly after behavioral tests.

“In this way, we were able to observe differences between (S)-ketamine and (R)-ketamine treatments in terms of neuronal activation across the whole brain, without having a predefined hypothesis,” says lead author of the study Rei Yokoyama. “Notably, we found that chronic social isolation led to decreased neuronal activation in the anterior insular cortex—a brain region that is important for emotional regulation—during social contact, and that (R)-ketamine, but not (S)-ketamine, reversed this effect.”

The researchers also found that mice treated with (R)-ketamine were better at recognizing unfamiliar versus familiar mice in a social memory test, indicating improved social cognition. Moreover, when neuronal activity was suppressed in the anterior insular cortex, the (R)-ketamine-induced improvements disappeared.

“These findings highlight the importance of the anterior insular cortex for the positive effects of (R)-ketamine on social impairments, at least in mice,” says Hitoshi Hashimoto, senior author of the study. “Together, our results indicate that (R)-ketamine may be better than (S)-ketamine for improving social cognition, and they suggest that this effect is dependent on restoring neuronal activation in the anterior insular cortex.”

Given that the rates of social isolation and depression are increasing worldwide, these findings are very important. (R)-ketamine is a promising treatment for isolation-induced social impairments and may contribute to a better quality of life in people with associated disorders.

More information:
(R)-ketamine restores anterior insular cortex activity and cognitive deficits in social isolation-reared mice, Molecular Psychiatry (2024). DOI: 10.1038/s41380-024-02419-6

Citation:
Improving social symptoms of depression with a common anesthetic (2024, February 22)
retrieved 22 February 2024
from https://medicalxpress.com/news/2024-02-social-symptoms-depression-common-anesthetic.html

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part may be reproduced without the written permission. The content is provided for information purposes only.

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Tags: healthimprovingsocial
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